Answer: Third choice -- ACB = DFE
Explanation:
Note how in the original equation ABC = DEF we have
A and D as the first letter
B and E as the second letter
C and F as the third letter
So this means A and D pair up, B and E pair up, so do C and F.
If we swap the second and third letters for each sequence, we go from ABC to ACB, and from DEF to DFE.
The letters stay connected with their corresponding paired counterparts.
